package com.hmdp.utils;

import cn.hutool.core.lang.UUID;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;

import java.util.Collections;
import java.util.concurrent.TimeUnit;

public class SimpleRedisLock implements ILock{
    private StringRedisTemplate stringRedisTemplate;

    private String name;
    private  static  final  String KEY_PREFIX = "lock:";
    private static final  String ID_PREFIX= UUID.randomUUID().toString(true);
    private static final DefaultRedisScript<Long> UNLOCK_SCRIPT;
    static {
        UNLOCK_SCRIPT =new DefaultRedisScript<>();
        UNLOCK_SCRIPT.setLocation(new ClassPathResource("unlock.lua"));
        UNLOCK_SCRIPT.setResultType(Long.class);
        //配置lua语言脚本
    }

    public SimpleRedisLock(String name,StringRedisTemplate stringRedisTemplate) {

        this.stringRedisTemplate = stringRedisTemplate;
        this.name = name;
    }


    @Override
    public boolean tryLock(long timeoutSec) {
      String ThreadId = ID_PREFIX+Thread.currentThread().getId() ;
        Boolean success =
                stringRedisTemplate.opsForValue()
                        .setIfAbsent(KEY_PREFIX + name, ThreadId , timeoutSec, TimeUnit.SECONDS);
        return Boolean.TRUE.equals(success);
    }

    @Override
    public void unlock() {
//        String ThreadId = ID_PREFIX+Thread.currentThread().getId() ;
//        String s = stringRedisTemplate.opsForValue().get(KEY_PREFIX + name);
//        if (ThreadId.equals(s)){
//        stringRedisTemplate.delete(KEY_PREFIX+name);
//        }
        stringRedisTemplate
                .execute(UNLOCK_SCRIPT, Collections.singletonList(KEY_PREFIX + name),
                        ID_PREFIX+Thread.currentThread().getId());
    }
}
